Hail history for San Mateo County, California
Every NOAA hail report filed in San Mateo County since 2017, with preliminary National Weather Service reports to November 3, 2026.
Readout · San Mateo County
- Last hail
- Mar 30, 2024
- 0.25 in, pea size
- Hail days, last 5 years
- 1
- since Nov 3, 2021 · 1 report
- Largest ever
- 0.25 in
- pea · Mar 30, 2024
9 reports on 9 days since 2017 · #35 of 47 California counties
Hail map · San Mateo County
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
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What the record says about San Mateo County
The latest hail report in San Mateo County is from March 30, 2024, 0.25 in (pea size). Since November 3, 2021 there has been one hail day; the biggest stones in that time were 0.25 in on March 30, 2024.
Over the 20 years 2006–2025, San Mateo County logged 9 reports on 9 hail days, about 0.5 reports a year. That is 13% more than the median California county (0.4 a year) and ranks #35 of 47 California counties for all-time reports. San Mateo County holds 1% of all 938 hail reports in California.
0% of reports with a size were 2 inches (hen egg) or larger, against 0% for the median California county. The largest hail on record here is 0.25 in (pea) on March 30, 2024 near 1.39 W (Sql)san Carlos Arpt.
Reports were up 900% in 2016–2025 (9) compared with 2006–2015 (0). The busiest year was 2017, with 4 reports on 4 days. Hail here peaks in January (44% of reports); 11% fall between April and June.
Reports a year 2006–2025 average
- San Mateo County 0.5
- Median California county 0.4
Hail days 2006–2025
- San Mateo County 9
- Median California county 7
Share 2 in or larger of sized reports
- San Mateo County 0%
- Median California county 0%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 1 | 1 | |||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 1 | 1 | |||||||||||
| 2018 | 1 | 1 | 2 | ||||||||||
| 2017 | 2 | 1 | 1 | 4 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Mar 30, 2024 | 1 | 0.25 in | — |
Largest hail on record
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| Mar 30, 2024 | 0.25 inpea | 1.39 W (Sql)san Carlos Arpt | $10 | 16:36 local · NCEI |
| Jan 16, 2020 | 0.25 inpea | 4 SE El Granada | — | 13:59 local · NCEI |
| Jan 20, 2019 | 0.25 inpea | 1 S Redwood City | — | 20:50 local · NCEI |
| Mar 17, 2018 | 0.25 inpea | San Carlos | — | 10:48 local · NCEI |
| Feb 22, 2018 | 0.25 inpea | Burlingame | — | 14:29 local · NCEI |
Size of every report
- Under 1 in 9 100%
- 1–2 in 0 0%
- 2 in + 0 0%
Most recent reports
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| Mar 30, 2024 | 0.25 inpea | 1.39 W (Sql)san Carlos Arpt | $10 | 16:36 local · NCEI |
| Jan 16, 2020 | 0.25 inpea | 4 SE El Granada | — | 13:59 local · NCEI |
| Jan 20, 2019 | 0.25 inpea | 1 S Redwood City | — | 20:50 local · NCEI |
| Mar 17, 2018 | 0.25 inpea | San Carlos | — | 10:48 local · NCEI |
| Feb 22, 2018 | 0.25 inpea | Burlingame | — | 14:29 local · NCEI |
| Sep 11, 2017 | 0.25 inpea | 1.14 NW Daly City | — | 17:46 local · NCEI |
| Apr 8, 2017 | 0.25 inpea | 3.07 S Half Moon Bay | — | 12:54 local · NCEI |
| Jan 23, 2017 | 0.25 inpea | 1.05 SSE San Mateo | $10 | 15:33 local · NCEI |
| Jan 22, 2017 | 0.25 inpea | 0.93 SW Half Moon Bay | $10 | 14:33 local · NCEI |
Smaller places with fewer than 10 reports
These places have too few reports for a page of their own, so their record lives here.
| Place | Reports | Hail days | Latest |
|---|---|---|---|
| Half Moon Bay | 3 | 3 | Jan 16, 2020 |
| Belmont | 1 | 1 | Mar 30, 2024 |
| Burlingame | 1 | 1 | Feb 22, 2018 |
| Emerald Lake Hills | 1 | 1 | Jan 20, 2019 |
| San Carlos | 1 | 1 | Mar 17, 2018 |
| San Mateo | 1 | 1 | Jan 23, 2017 |
Questions about hail in San Mateo County
How often does it hail in San Mateo County, California?
9 hail reports have been logged in San Mateo County since 2017. Over the 20 years 2006–2025 that averages 0.5 reports a year. That ranks #35 of 47 California counties by number of reports.
When is hail season in San Mateo County?
Most reports come in January, March, February. January alone accounts for 44% of all reports.
What is the largest hail recorded in San Mateo County?
0.25 in (pea size) on March 30, 2024 near 1.39 W (Sql)san Carlos Arpt. 0% of reports here were 2 inches or larger.
When did it last hail in San Mateo County?
The most recent report in this data is from March 30, 2024 (0.25 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has San Mateo County had in the last five years?
1 separate days with hail reports since November 3, 2021, adding up to 1 reports. The most recent was March 30, 2024.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.